三次元流れ場中にある強磁性棒状粒子のレオロジー特性に印加磁場が及ぼす影響(流体工学,流体機械)

概要

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We have analyzed the time-dependent behaviors of the rheological properties of a dilute colloidal dispersion composed of the ferromagnetic spherocylinder particles influenced by the external magnetic field. A series of basic equations is derived for the orientational distributions of the particles in steady three dimensional flow by using the perturbation expansion method. Exact solutions of the basic equations are obtained theoretically. By using the solutions, we have discussed the viscosity induced by the external magnetic field. The viscosity is mainly described by the simple fractional functions of the magnetic field. The coefficients of the fractional functions make a classification of the behaviors of the viscosity. The reference time obtained from the rate of the convergence to the steady state of the viscosity is shorter for the stronger magnetic field, because the orientations of the particles are arranged by the strong magnetic fields. We have derived the condition to generate the viscosity by the magnetic field, and the condition to increase the viscosity with the increased magnetic field.
社団法人日本機械学会の論文
2007-07-25